University of Twente Student Theses


Short time degradation of thermoplastic composites during stamp forming

Kamermans, M. (2018) Short time degradation of thermoplastic composites during stamp forming.

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Abstract:The use of thermoplastic composites has increased rapidly in the automotive and aerospace industry in the last years. Carbon fiber reinforced polyether-ether-ketone (C/PEEK) is a high performance thermoplastic composite which is suitable for different components and production techniques, one of those techniques is stamp forming. During the stamp forming process the thermoplastic composite laminate needs to be reheated above melt, which can induce degradation. Therefore the objective of this research is to use realistic heating settings to determine short time degradation during the stamp forming process. 8-ply laminate are heated using an infra red (IR) oven set to temperatures of 445◦C (for 95, 240 and 480 seconds) and 480◦C (for 55 and 150 seconds) before being formed. Differential Scanning Calorimetry (DSC) measurements are used to determine the crystallinity content of the treated laminates, no significant changes are observed in the results. This is confirmed by 3- point bending measurements where no significant decrease in mechanical performance is observed. Therefore this research shows that the chosen heating parameters do not result in degradation of 8-ply C/PEEK laminates.
Item Type:Internship Report (Master)
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
Keywords:thermoplastic composites, carbon fiber, polyether-ether-ketone, PEEK, C/PEEK, infra red, IR, differential scanning calorimetry, DSC, 3-point bending, crystallinity, degradation
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